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Atomic Mass Units I mentioned that these are relative atomic weights because they were compared to hydrogen then oxygen and then carbon-12. One way of dealing with atomic weights that gets around the "relative" aspect would be. I understand that the mass of carbon-12 has been defined 12 u. However, protons and neutrons have a relative mass of 1 each and there are 6 protons and 6 neutrons in a carbon-12 atom which makes a relative atomic mass of 12. So. The atomic mass of an atom of carbon is 12 amu, and the atomic mass of an atom of oxygen is 16 amu. To produce CO2, 16 g of oxygen combine with 12 g of carbon. To produce CO2, 32 g of oxygen combine with 12 g of carbon. 2008/10/09 · it is 12. amu is defined as 1/12 the weight of a carbon atom. this is because carbon has 12 protons, so its supposed to roughly be the weight of a single atom. This is not strictly true because binding energy in an atom.

Define atomic mass unit. atomic mass unit synonyms, atomic mass unit pronunciation, atomic mass unit translation, English dictionary definition of atomic mass unit. n. Abbr. amu A unit of mass equal to 1/12 the mass of the. Problem 41RQ from Chapter 2.5: What is the mass in amu of a carbon-12 atom? Why is the at. Get solutions.

The MOLE mol is a unit of measurement that is the amount of a pure substance containing the same number of chemical units atoms, molecules etc. as there are atoms in exactly 12 grams of carbon-12 i.e., 6.022 X 10 23. 23. By multiplying 12 amu by 1.66 x 10^-27 kg/amu we find the mass of carbon-12 in kilograms is 1.99 10^-26 kg. This conversion can be used to convert atoms and molecules from atomic mass units to grams and kilograms. In this. The following data was collected from a compilation of data from the CRC Handbook and other references. If any errors or corrections are notes please advise us and we will make the corrections. Based on the Carbon 12 Standard. Atomic mass of isotope carbon-12 is exactly 12 amu whereas all others of carbon and other elements are referred to that and do not have integer values. % abundance isotope 1 Atomic mass = x mass isotope 1 100 g 10.

Atomic Mass Atomic mass is based on a relative scale and the mass of 12C carbon twelve is defined as 12 amu; so, this is an exact number. Why do we specify 12C? We do not simply state that the mass of a C atom is 12 AMU.